275 research outputs found
Tetrakis(μ-2-methylbenzoato)bis[(2-methylbenzoic acid)copper(II)]
In the title centrosymmetric dinuclear compound, [Cu2(C8H7O2)4(C8H8O2)2], four o-toluate anions form a cage around two Cu atoms in a syn–syn configuration. Two more o-toluic acid molecules are apically bonded to the Cu atoms, which show a square-pyramidal coordination geometry. The acid H atoms are hydrogen bonded to the cage carboxyl O atoms [O⋯O = 2.660 (2) Å]. The molecular packing forms a puckered pseudo-hexagonal close-packed layer in the (h00) plane, with soft intermolecular H⋯H contacts (2.46–2.58 Å)
Tetrakis(μ-4-ethylbenzoato-κ2 O:O′)bis[(4-ethylbenzoic acid-κO)copper(II)]
The molecule of the title compound, [Cu2(C9H9O2)4(C9H10O2)2], lies on a center of inversion. It consists of four bridging ethylbenzoate ligands, forming a cage around two Cu atoms in a syn–syn configuration, and two monodentate ethylbenzoic acid ligands bonded apically to the square-planar Cu atoms. The Cu⋯Cu distance is 2.6047 (5) Å
Nonleptonic Two-Body Decays of D Mesons in Broken SU(3)
Decays of the D mesons to two pseudoscalars, to two vectors, and to
pseudoscalar plus vector are discussed in the context of broken flavor SU(3). A
few assumptions are used to reduce the number of parameters. Amplitudes are fit
to the available data, and predictions of branching ratios for unmeasured modes
are made.Comment: LaTeX, 24 page
Magnetic moments of the SU(3) decuplet baryons in the chiral quark-soliton model
Magnetic moments of baryons are studied within the chiral quark soliton model
with special emphasis on the decuplet of baryons. The model is used to identify
all symmetry breaking terms proportional to . Sum rules for the
magnetic moments are derived. A ``model-independent'' analysis of the symmetry
breaking terms is performed and finally model calculations are presented, which
show the importance of the rotational corrections for cranking of
the soliton.Comment: 22 pages, RevTex. The final version accepted for publication in Phys.
Rev.
SU(3)_flavor analysis of two-body weak decays of charmed baryons
We study two-body weak decays of charmed baryons \Lambda_c and \Xi_c into an
octet or decuplet baryon and a pseudoscalar meson employing the SU(3) flavor
symmetry. Using certain measured Cabibbo-favored modes, we fix the reduced
amplitudes and predict the branching ratios of various decays of charmed
baryons in the Cabibbo-enhanced, -suppressed and -doubly suppressed modes.Comment: 25 pages, No figure, Phys. Rev. D (to appear
Resonant Two-body D Decays
The contribution of a resonance to is
calculated by applying the soft pion theorem to , and is
found to be about 30% of the measured amplitude and to be larger than the
component of this amplitude. We estimate a 70% contribution to
the total amplitude from a higher resonance. This implies large
deviations from factorization in D decay amplitudes, a lifetime difference
between D^0 and D^+, and an enhancement of mixing due to SU(3)
breaking.Comment: To be published in Physical Review Letters, some corrections,
references update
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